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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-1851) Broken master failover
Date Thu, 02 Dec 2010 03:53:11 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Gray resolved HBASE-1851.
----------------------------------

    Resolution: Invalid

Not applicable anymore

> Broken master failover
> ----------------------
>
>                 Key: HBASE-1851
>                 URL: https://issues.apache.org/jira/browse/HBASE-1851
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: Jonathan Gray
>
> Master crashed, SIGSEGV (0xb) at pc=0x00000031a40fea07, pid=14689, tid=1133910336.  Four
other masters running ready to take the failover.  I see where we move to new master but there
is an error:
> {code}
> 2009-09-13 22:07:02,061 DEBUG org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Wrote
master address XX.XX.XX.251:20000 to ZooKeeper
> 2009-09-13 22:07:02,064 WARN org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Failed
to set state node in ZooKeeper
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists
for /hbase/shutdown
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:110)
>         at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
>         at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:522)
>         at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.setClusterState(ZooKeeperWrapper.java:279)
>         at org.apache.hadoop.hbase.master.HMaster.writeAddressToZooKeeper(HMaster.java:270)
>         at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:255)
>         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>         at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
>         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
>         at java.lang.reflect.Constructor.newInstance(Unknown Source)
>         at org.apache.hadoop.hbase.master.HMaster.doMain(HMaster.java:1200)
>         at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:1241)
> {code}
> Is /hbase/shutdown now ephemeral?
> Otherwise, the transition went off well it seems.
> Except, if I look in zk -- this is a good while after teh event -- I do not see a master..
its empty.  Do we not record in zk on failover?
> But then a split comes in:
> 2009-09-17 05:50:05,070 INFO org.apache.hadoop.hbase.master.BaseScanner: All 1 .META.
region(s) scanned
> 2009-09-17 05:50:30,745 INFO org.apache.hadoop.hbase.master.ServerManager: Processing
MSG_REPORT_SPLIT: enwikibase_dumpurls,,1253145470066: Daughters; enwikibase_dum
> purls,,1253166628107, enwikibase_dumpurls,EzAdzwPBtG_o9BLsEqu4bV\x3D\x3D,1253166628107
from aa0-018-6.u.powerset.com,20020,1251458355425; 1 of 3
> 2009-09-17 05:50:30,745 DEBUG org.apache.hadoop.hbase.master.RegionManager: Assigning
for address: XX.XX.44.91:20020, startcode: 1251458355425, load: (requests=0, r
> egions=3, usedHeap=490, maxHeap=2031): total nregions to assign=2, nregions to reach
balance=4, isMetaAssign=false
> 2009-09-17 05:50:30,838 DEBUG org.apache.hadoop.hbase.master.RegionManager: Assigning
for address: XX.XX.44.49:20020, startcode: 1250638276455, load: (requests=3, r
> egions=4, usedHeap=134, maxHeap=2031): total nregions to assign=2, nregions to reach
balance=4, isMetaAssign=false
> 2009-09-17 05:50:31,117 DEBUG org.apache.hadoop.hbase.master.RegionManager: Assigning
for address: XX.XX.45.128:20020, startcode: 1250638269214, load: (requests=5, 
> regions=4, usedHeap=130, maxHeap=2031): total nregions to assign=2, nregions to reach
balance=4, isMetaAssign=false
> 2009-09-17 05:50:31,119 DEBUG org.apache.hadoop.hbase.master.RegionManager: Assigning
for address: XX.XX.45.221:20020, startcode: 1250638268709, load: (requests=5, 
> regions=4, usedHeap=82, maxHeap=2031): total nregions to assign=2, nregions to reach
balance=4, isMetaAssign=false
> 2009-09-17 05:50:31,150 DEBUG org.apache.hadoop.hbase.master.RegionManager: Assigning
for address: XX.XX.44.75:20020, startcode: 1250638276632, load: (requests=9, r
> egions=4, usedHeap=284, maxHeap=2031): total nregions to assign=2, nregions to reach
balance=4, isMetaAssign=false
> 2009-09-17 05:50:31,215 DEBUG org.apache.hadoop.hbase.master.RegionManager: Assigning
for address: XX.XX.45.180:20020, startcode: 1250638269143, load: (requests=11,
>  regions=4, usedHeap=132, maxHeap=2031): total nregions to assign=2, nregions to reach
balance=4, isMetaAssign=false
> 2009-09-17 05:50:31,265 DEBUG org.apache.hadoop.hbase.master.RegionManager: Assigning
for address: XX.XX.45.121:20020, startcode: 1250638269297, load: (requests=5, 
> regions=4, usedHeap=54, maxHeap=2031): total nregions to assign=2, nregions to reach
balance=4, isMetaAssign=false
> ...
> And we never recover from the above (12 hours and still at it).

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